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Digital image correlation and tracking
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<p>Digital image correlation and tracking is an optical method that employs tracking and <a href="/facts/Image_registration/y2KUwdRL">image registration</a> techniques for accurate 2D and 3D measurements of changes in 2D images or 3D volumes. This method is often used to measure full-field <a href="/facts/Displacement_field_(mechanics)/vp04QtH0">displacement</a> and <a href="/facts/Strain_(materials_science)/xK7R59oI">strains</a>, and it is widely applied in many areas of science and engineering. Compared to <a href="/facts/Strain_gauge/w12yKexN">strain gauges</a> and <a href="/facts/Extensometer/KxgLtmMk">extensometers</a>, digital image correlation methods provide finer details about deformation, due to the ability to provide both local and average data. </p>